Probably iCE40 cased with a PCIe female edge connector to make it easy/cheap to build I/O modules for it. Think cheap PCB soldered to tgt.
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Brainstorming an open FPGA breakout/devboard design with lots (>100) of I/O and USB. I should start writing a design doc soon...
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Use cases: system probing/reversing, cartridge emu, massive I/O (LED screen?), logic analyzer, memory dumping/programming.
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E.g. daughterboard provides 5V level translation, then uber cheap PCB-only frontends interface to every retro cartridge connector ever.
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Stick it into a console and it's an emu w/logic analyzer. Put a cart slot on it and you can use it to dump. Enough I/O left for capture.
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For GBA experiments I could hook up the entire cartridge connector, LCD connector (video capture), buttons and audio.
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End of conversation
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I'm working on a very similar project :-)
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Do tell :)
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On the edge. iCE perhaps not fast enough to saturate USB3, but I want more than USB2... research needed.
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You should definitely break those I/O out into the most expensive hirose connector that Digikey sells
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If you proxy all chip-2-chip IO thru FPGAs and clock gate them you can create a pretty low level debugger. Reminds me of processor emulation
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